﻿80 
  

  

  PEOF. 
  T. 
  G. 
  B01TOEY 
  OST 
  TWO 
  TEAVEESES 
  OF 
  THE 
  

  

  On 
  arriving 
  at 
  that 
  point 
  we 
  spent 
  a 
  considerable 
  time 
  in 
  vainly 
  

   endeavouring 
  to 
  strike 
  the 
  northern 
  edge 
  of 
  this 
  massif, 
  thongh 
  we 
  

   saw 
  the 
  rock 
  at 
  a 
  distance 
  across 
  a 
  valley. 
  Our 
  failure 
  was, 
  I 
  believe, 
  

   caused 
  by 
  a 
  slight 
  misunderstanding 
  of 
  our 
  map, 
  which 
  was 
  on 
  a 
  

   small 
  scale 
  and 
  not 
  in 
  much 
  detail. 
  Thus 
  we 
  missed 
  the 
  only 
  

  

  place 
  where 
  the 
  massif, 
  as 
  I 
  now 
  

   see, 
  can, 
  without 
  much 
  trouble, 
  be 
  

   reached 
  from 
  the 
  highroad. 
  We 
  

   saw, 
  however, 
  some 
  scattered 
  frag- 
  

   ments, 
  which 
  were 
  mainly 
  gabbro, 
  as 
  

   above 
  described. 
  

  

  Jurassic 
  limestone, 
  often 
  dark 
  in 
  

   colour, 
  extends 
  to 
  the 
  commence- 
  

   ment 
  of 
  the 
  steeper 
  part 
  of 
  the 
  

   descent 
  towards 
  Italy 
  (fig. 
  3). 
  Here 
  

   it 
  has 
  a 
  high 
  dip, 
  75° 
  or 
  more 
  to 
  

   the 
  W.N.W. 
  Beneath 
  a 
  thick 
  con- 
  

   spicuous 
  mass 
  of 
  this 
  rock 
  comes 
  a 
  

   calcareous 
  deposit 
  of 
  uncertain 
  nature, 
  

   not 
  unlike 
  a 
  tufa 
  *, 
  to 
  which 
  succeeds 
  

   a 
  dull-green 
  serpentine, 
  rendered 
  very 
  

   schistose 
  by 
  crushing. 
  Its 
  rude 
  

   cleavage 
  - 
  structure 
  appears 
  to 
  be 
  

   roughly 
  parallel 
  with 
  the 
  bedding 
  of 
  

   the 
  dark 
  limestone. 
  To 
  th 
  e 
  serpentine, 
  

   of 
  which 
  there 
  is 
  a 
  rather 
  thick 
  mass, 
  

   succeeds 
  a 
  lead-coloured, 
  rather 
  cal- 
  

   careous 
  mica-schist, 
  also 
  intensely 
  

   crushed, 
  the 
  resulting 
  structure 
  being 
  

   parallel 
  with 
  that 
  in 
  the 
  serpentine. 
  

   This 
  much 
  resembles 
  some 
  members 
  

   (when 
  highly 
  crushed) 
  of 
  the 
  " 
  Tcalk- 
  

   haltige 
  grauer 
  ScJiiefer" 
  of 
  the 
  Central 
  

   Alps. 
  The 
  two 
  rocks 
  may 
  be 
  seen 
  

   near 
  together 
  : 
  but 
  in 
  the 
  neighbour- 
  

   hood 
  of 
  the 
  road 
  we 
  could 
  not 
  find 
  an 
  

   actual 
  junction. 
  Between 
  this 
  place 
  

   and 
  Cesanne, 
  we 
  saw 
  in 
  situ 
  only 
  

   varieties 
  of 
  this 
  crushed 
  mica-schist, 
  

   and 
  below 
  the 
  village 
  is 
  more 
  of 
  the 
  

   same 
  rock, 
  rather 
  darker 
  in 
  colour 
  

   and 
  somewhat 
  more 
  calcareous, 
  its 
  

   dominant 
  structure, 
  which 
  dips 
  to 
  the 
  

   S.W. 
  at 
  a 
  moderate 
  angle, 
  being 
  the 
  

   result 
  of 
  subsequent 
  pressure. 
  (Ap- 
  

   pendix, 
  p. 
  103.) 
  

  

  Part 
  of 
  the 
  ' 
  Gypse 
  et 
  carnegules 
  ' 
  (Trias) 
  of 
  Prof. 
  Lory's 
  map. 
  

  

  